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Two waves are traveling in the same direction along astretched string. Each has an amplitude of 4.0cm, assume the wavesare 45o out of phase. What is the amplitude of the resultant wave?
suppose there are 500 billion stars in the galaxy. How does your answer change if there are only 110 civilizations instead of 1.2×10^4.
A dolphin located in sea water at a temperature of 25°C emits a sound directed toward the bottom of the ocean 100 m below
A key falls from a bridge that is 49 m above the water. It falls directly into a model boat, moving with constant velocity , What is the speed of the boat
Two balls, of masses = 60 and = 70, are suspended. The lighter ball is pulled away to a 67 angle with the vertical and released. Suppose that the positive axis is directed to the right.
A photon with wavelength 0.02680 nm strikes a free electron that is initially at rest. What is the de Broglie wavelength of the electron after its collision with the photon
a. a particle with spin 1 has orbital angular momentum l0. what are the possible values for the total angular momentum
A parallel plate capacitor has a potential difference between the plates of 80 V. what is the electrical energy stored by this capacitor
consider light that is refracted by a prism shaped like an equilateral triangle. the incident ray is parallel with the
A communications satellite with a mass of 400 is in a circular orbit about the Earth. The radius of the orbit is 2.8×10^4 as measured from the center of Earth. Compute the weight of the satellite on the surface of the earth.
A 5.20 102 kg hot-air balloon takes off from rest at the surface of the earth. The nonconservative wind and lift forces take the balloon up, doing +9.70 104 J of work on the balloon in the process. At what height above the surface of the earth does t..
A positron is a particle with the same mass and magnitude charge as an electron, but a positron has a positive charge. If a positron and electron are held a distance of 0.900 pm apart and then both are released from rest, when they are 0.324 pm away ..
At a rock concert, the engineer decides that the music isn't loud enough. He turns up the amplifiers so that the amplitude of the sound, By what percentage does the intensity increase
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